This ab exercise is better than crunches — so I did 40 reps a day for a week
When it comes to working your abs, you’ve probably tried most of the best ab exercises, with crunches, sit-ups, and planks topping the list. But what about ab roll up? Apparently, this simple-sounding move is more effective than crunches when it comes to working your abdominal muscles and sculpting your core. To find out more,…